java多线程的使用2

1.join与interrupt的用法

class Sleeper extends Thread
{
    private int duration;
    public Sleeper(String name,int sleepTime)
    {
        super(name);
        duration=sleepTime;
        start();
    }
    public void run(){
        try {
            sleep(duration);
        } catch (Exception e) {
            System.out.println(getName()+" was interrupted."+"isInterrupted():"+isInterrupted());
            return;
        }
        System.out.println(getName()+" has awakened");
    }
}

class Joiner extends Thread{
    private Sleeper sleeper;
    public Joiner(String name,Sleeper sleeper){
        super(name);
        this.sleeper=sleeper;
        start();
    }
    public void run(){
        try {
            sleeper.join();
        } catch (Exception e) {
            System.out.println("Interrupted");
        }
        System.out.println(getName()+" join completed");
    }
}

public class Joining {
    public static void main(String[] args) {
        Sleeper
        sleepy=new Sleeper("Sleepy", 1500),
        grumpy=new Sleeper("Grumpy", 1500);
        Joiner
        dopey=new Joiner("dopey", sleepy),
        doc=new Joiner("doc", grumpy);
        grumpy.interrupt();
    }
}

2.未处理异常

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

class ExceptionThread2 implements Runnable {
    public void run() {
        Thread t = Thread.currentThread();
        System.out.println("run() by " + t);
        System.out.println("eh=" + t.getUncaughtExceptionHandler());
        throw new RuntimeException();
    }
}

class MyUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        // TODO Auto-generated method stub
        System.out.println("cauth" + e);
    }
}

class HandlerThreadFactory implements ThreadFactory {
    @Override
    public Thread newThread(Runnable r) {
        System.out.println(this + " creating new Thread");
        Thread t = new Thread(r);
        System.out.println("created " + t);
        t.setUncaughtExceptionHandler(new MyUncaughtExceptionHandler());
        System.out.println("eh=" + t.getUncaughtExceptionHandler());
        return t;
    }
}

public class CaptureUncaughtException {
    public static void main(String[] args) {
        ExecutorService exec = Executors
                .newCachedThreadPool(new HandlerThreadFactory());
        exec.execute(new ExceptionThread2());
    }
}

//默认处理异常

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SettingDefaultHandler {
public static void main(String[] args) {
Thread.setDefaultUncaughtExceptionHandler(new MyUncaughtExceptionHandler());
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new ExceptionThread());
}
}

3.(1)synchronized void f(){ /* ... */ }

(2)private Object syncObject=new Object();
       synchronized(syncObject){
          ...
        }

同步方法

4.同步方法

private Lock lock=new ReentrantLock();
private int i=0;
public int next(){
lock.lock();
try{
...
return i;
}
finally{
lock.unlock();
}
}

5.java.lang.ThreadLocal

线程本地存储

6.wait() 挂起线程  notifyAll() 唤醒wait()中挂起的线程

7.

ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new WaxOff(car));
exec.execute(new WaxOn(car));
TimeUnit.SECONDS.sleep(5);
exec.shutdownNow();//内部使用interrupt()中止线程池中的所有线程
//exec.shutdown(); 

8.单个的生产者、消费者

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

class Meal {
private final int orderNum;

public Meal(int orderNum) {
this.orderNum = orderNum;
}

public String toString() {
return "Meal " + orderNum;
}
}

class WaitPerson implements Runnable {
private Restaurant restaurant;

public WaitPerson(Restaurant r) {
restaurant = r;
}

public void run() {
try {
while (!Thread.interrupted()) {
//TimeUnit.SECONDS.sleep(3);
synchronized (this) {
while (restaurant.meal == null) {
wait();
}
}
System.out.println("Waitperson go " + restaurant.meal);
synchronized (restaurant.chef) {
restaurant.meal = null;
restaurant.chef.notifyAll();
}
}
} catch (InterruptedException e) {
//如果线程已经interrupted了，执行sleep就会进入InterruptedException，所以要加此异常捕获
System.out.println("WaitPerson interrupted");
}
}
}

class Chef implements Runnable {
private Restaurant restaurant;
private int count = 0;

public Chef(Restaurant r) {
restaurant = r;
}

public void run() {
try {
//TimeUnit.SECONDS.sleep(1);
while (!Thread.interrupted()) {
synchronized (this) {
while (restaurant.meal != null)
wait();
}
if (++count == 10) {
System.out.println("Out of food,closing");
restaurant.exec.shutdownNow();
}
System.out.println("Order up!");
synchronized (restaurant.waitPerson) {
restaurant.meal = new Meal(count);
restaurant.waitPerson.notifyAll();
}
//TimeUnit.MICROSECONDS.sleep(100);
}
} catch (InterruptedException e) {
//如果线程已经interrupted了，执行sleep就会进入InterruptedException，所以要加此异常捕获
System.out.println("Chef interrupted");
}
}
}

public class Restaurant {
Meal meal;
ExecutorService exec = Executors.newCachedThreadPool();
WaitPerson waitPerson = new WaitPerson(this);
Chef chef = new Chef(this);

public Restaurant() {
exec.execute(chef);
exec.execute(waitPerson);
}

public static void main(String[] args) {
new Restaurant();
}
}

9.已实现同步的队列集合

import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.TimeUnit;

class Toast {
    public enum Status {
        DRY, BUTTERED, JAMMED
    }

    private Status status = Status.DRY;
    private final int id;

    public Toast(int idn) {
        id = idn;
    }

    public void butter() {
        status = Status.BUTTERED;
    }

    public void jam() {
        status = Status.JAMMED;
    }

    public Status getStatus() {
        return status;
    }

    public int getId() {
        return id;
    }

    public String toString() {
        return "Toast " + id + ": " + status;
    }
}

class ToastQueue extends LinkedBlockingDeque<Toast> {
}

class Toaster implements Runnable {
    private ToastQueue toastQueue;
    private int count = 0;
    private Random rand = new Random(47);

    public Toaster(ToastQueue tq) {
        toastQueue = tq;
    }

    public void run() {
        try {
            while (!Thread.interrupted()) {
                TimeUnit.MICROSECONDS.sleep(100 + rand.nextInt(500));
                Toast t = new Toast(count++);
                System.out.println(t);
                toastQueue.put(t);
            }
        } catch (InterruptedException e) {
            System.out.println("Toaster interrupted");
        }
        System.out.println("Toaster off");
    }
}

class Butterer implements Runnable {
    private ToastQueue dryQueue, butteredQueue;

    public Butterer(ToastQueue dry, ToastQueue buttered) {
        dryQueue = dry;
        butteredQueue = buttered;
    }

    public void run() {
        try {
            while (!Thread.interrupted()) {
                Toast t = dryQueue.take();
                t.butter();
                System.out.println(t);
                butteredQueue.push(t);
            }
        } catch (InterruptedException e) {
            System.out.println("Butter interrupted");
        }
        System.out.println("Butterer off");
    }
}

class Jammer implements Runnable {
    private ToastQueue butteredQueue, finishedQueue;

    public Jammer(ToastQueue butterd, ToastQueue finished) {
        butteredQueue = butterd;
        finishedQueue = finished;
    }

    public void run() {
        try {
            while (!Thread.interrupted()) {
                Toast t = butteredQueue.take();
                t.jam();
                System.out.println(t);
                finishedQueue.put(t);
            }
        } catch (InterruptedException e) {
            System.out.println("Jammer interrupted");
        }
        System.out.println("Jammer off");
    }
}

class Eater implements Runnable {
    private ToastQueue finishedQueue;
    private int counter = 0;

    public Eater(ToastQueue finished) {
        finishedQueue = finished;
    }

    public void run() {
        try {
            while (!Thread.interrupted()) {
                Toast t = finishedQueue.take();
                if (t.getId() != counter++
                        || t.getStatus() != Toast.Status.JAMMED) {
                    System.out.println(">>>> Error: " + t);
                    System.exit(1);
                } else {
                    System.out.println("Chomp! " + t);
                }
            }
        } catch (InterruptedException e) {
            System.out.println("Eater interrupted");
        }
        System.out.println("Eater off");
    }
}

public class ToastOMatic {
    public static void main(String[] args) throws InterruptedException {
        ToastQueue dryQueue = new ToastQueue(), butteredQueue = new ToastQueue(), finishedQueue = new ToastQueue();
        ExecutorService exec = Executors.newCachedThreadPool();
        exec.execute(new Toaster(dryQueue));
        exec.execute(new Butterer(dryQueue, butteredQueue));
        exec.execute(new Jammer(butteredQueue, finishedQueue));
        exec.execute(new Eater(finishedQueue));
        TimeUnit.SECONDS.sleep(5);
        exec.shutdownNow();
    }
}

10.输入输出管道

import java.io.IOException;
import java.io.PipedReader;
import java.io.PipedWriter;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

class Sender implements Runnable {
    private Random rand = new Random();
    private PipedWriter out = new PipedWriter();

    public PipedWriter getPipedWriter() {
        return out;
    }

    public void run() {
        try {
            while (true) {
                for (char c = 'A'; c <= 'Z'; c++) {
                    out.write(c);
                    TimeUnit.MILLISECONDS.sleep(rand.nextInt());
                }
            }
        } catch (IOException e) {
            System.out.println(e + " Sender write exception");
        } catch (InterruptedException e) {
            System.out.println(e + " Sender sleep interrupted");
        }
    }
}

class Receiver implements Runnable {
    private PipedReader in;

    public Receiver(Sender sender) throws IOException {
        in = new PipedReader(sender.getPipedWriter());
    }

    public void run() {
        try {
            while (true) {
                System.out.println("Read: " + (char) in.read() + ".");
            }
        } catch (IOException e) {
            System.out.println(e + " Receiver read exception");
        }
    }
}

public class PipedIO {
    public static void main(String[] args) throws Exception {
        Sender sender = new Sender();
        Receiver receiver = new Receiver(sender);
        ExecutorService exec = Executors.newCachedThreadPool();
        exec.execute(sender);
        exec.execute(receiver);
        TimeUnit.SECONDS.sleep();
        exec.shutdownNow();
    }
}